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Compound flux of high-MgO sinter ore, and preparation method and application of the compound flux

A technology of composite flux and sinter, applied in the field of iron ore powder sintering, can solve the problems of poor strength of high MgO sinter

Inactive Publication Date: 2015-06-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem of poor strength of high MgO sinter in the prior art. The present invention discloses a composite flux, which improves the mineralization of sinter by promoting the formation of calcium ferrite liquid phase and the dissolution of MgO in it. rate, obtain a reasonable mineral composition and mineral phase structure, thereby increasing the strength

Method used

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  • Compound flux of high-MgO sinter ore, and preparation method and application of the compound flux
  • Compound flux of high-MgO sinter ore, and preparation method and application of the compound flux
  • Compound flux of high-MgO sinter ore, and preparation method and application of the compound flux

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Effect test

Embodiment 1

[0027] The preparation method of composite flux for strengthening the production of high-MgO type sinter, the water-soluble additive is B2O3, which is dissolved in water to make an aqueous solution; the source of MgO is magnesium oxide (MgO), and the mass ratio of MgO and B2O3 is 100:2, so that B2O3 adheres to the surface of the MgO source material, put it in an oven for drying at 95°C, and obtain a composite flux that strengthens the production of high-MgO sinter.

[0028] Mix the composite flux with iron ore powder and quicklime, and the mixing ratio is calculated based on the basicity of 2.0 and 4% MgO in the sinter composition. Sinter in an air atmosphere, mix the mixture, take 2g and put it into a φ15mm die, press it into a round cake at a pressure of 5MPa, put it into the furnace at 500°C, and raise the temperature to 1250°C at a speed of 20°C / min Sintering is carried out, and after reaching the temperature, the sample is taken out and cooled in air. Test the X-ray diff...

Embodiment 2

[0030] The preparation method of composite flux for strengthening the production of high-MgO type sinter, the water-soluble additive is B2O3, which is dissolved in water to make an aqueous solution; the source of MgO is magnesium oxide (MgO), and the mass ratio of MgO and B2O3 is 10:1. B2O3 adheres to the surface of the MgO source material, put it in an oven for drying at 95°C, and obtain a composite flux that strengthens the production of high-MgO sinter.

[0031] Mix the composite flux with iron ore powder and quicklime, and the mixing ratio is calculated based on the basicity of 2.0 and 4% MgO in the sinter composition. Sinter in an air atmosphere, mix the mixture, take 2g and put it into a φ15mm die, press it into a round cake at a pressure of 5MPa, put it into the furnace at 500°C, and raise the temperature to 1250°C at a speed of 20°C / min Sintering is carried out, and after reaching the temperature, the sample is taken out and cooled in air. Test the X-ray diffraction c...

Embodiment 3

[0033] The preparation method of composite flux for strengthening the production of high-MgO type sinter, the water-soluble additive is CaCl2, which is dissolved in water to make an aqueous solution; the source of MgO is magnesite (MgCO3), and the mass ratio of MgCO3 and CaCl2 is 50:2. Make CaCl2 adhere to the surface of MgCO3 material, put it in an oven for drying at 90°C, and obtain a composite flux that strengthens the production of high-MgO sintered ore.

[0034] Mix the composite flux with iron ore powder and quicklime, and the mixing ratio is calculated based on the basicity of 2.0 and 3% MgO in the sinter composition. Sinter in an air atmosphere, mix the mixture, take 2g and put it into a φ15mm die, press it into a round cake at a pressure of 5MPa, put it into the furnace at 500°C, and raise the temperature to 1250°C at a speed of 20°C / min Sintering is carried out, and after reaching the temperature, the sample is taken out and cooled in air. Test the X-ray diffraction...

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Abstract

The invention relates to a compound flux of high-MgO sinter ore, and a preparation method and application of the compound flux, belongs to the field of hematite sintering. The compound flux comprises a MgO source and a water-soluble additive, wherein the water-soluble additive is a combination of one or more than one of boric anhydride, calcium chloride, ferric oxalate, iron nitrate and ammonium ferrie oxalate. The preparation method comprises the following steps: first, dissolving the water-soluble additive in water; then, pouring the MgO source material to realize that the additive is uniformly adhered on the surfaces of the MgO source particles; putting into a drying oven below the temperature of 95 DEG C for drying, thereby obtaining the compound flux of the high-MgO sinter ore. During sintering, the compound flux, the hematite and the lime flux are mixed together to serve as the MgO flux, so that the MgO content in the sinter ore can be increased to 4 percent. Meanwhile, the additive has a low melting point, the sintering mineralization rate is improved, and as a result, reasonable mineral composition and phase structure can be obtained, the sinter ore strength and high-temperature metallurgical property can be improved, also, the finished product ratio and drum rotating index are obviously improved.

Description

technical field [0001] The invention belongs to the field of iron ore powder sintering, and in particular relates to a composite flux for high-MgO sintered ore, a preparation method, and an application thereof. technical background [0002] With the increase of steel production year by year, high-quality iron ore resources tend to be scarce, and the development of high-aluminum iron ore resources has attracted people's attention. At the same time, increasing the amount of high-alumina iron ore on the blast furnace has achieved better economic benefits and promoted the development and utilization of high-alumina iron ore resources. However, the aluminum content in the sinter increases, and the Al in the blast furnace slag 2 o 3 increased, the viscosity of slag increased, and the desulfurization capacity decreased, resulting in difficulties in blast furnace operation and restricting the use of high-alumina iron ore. At present, the solution to this problem is to increase th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
Inventor 郭兴敏韩冬姚君豪
Owner UNIV OF SCI & TECH BEIJING
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